Excavating
Patent
1995-03-02
1998-11-24
Elmore, Reba I.
Excavating
371 4016, 360 47, 360 53, H03M 1300
Patent
active
058417940
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an error correction processing method and apparatus, for example, the present invention relates to a method for improving the error correcting ability in signal processing in a digital video signal recording and reproduction apparatus which records and reproduces video signals at a high density in block units.
BACKGROUND ART
As one conventional apparatus which performs processing for error correction, a digital video tape recording and reproduction apparatus (digital VTR) will be described.
When a digital VTR records, it adds error correction codes to the video signals and records the result on magnetic tape. When reproducing recorded video signals, it processes the reproduced signals read from the magnetic tape using the error correction codes to correct any errors in the reproduced video signals.
In a digital VTR, sometimes complex error occurs comprising a mixture of random errors occurring due to thermal noise of the recording and reproduction amplifiers, dust adhering to the magnetic tape, etc. and burst errors occurring due to scratches made along the running direction of the magnetic tape etc.
As such error correction codes, there are known error correction codes using inner codes and error correction codes using outer codes. In general, inner codes are defined in the lateral direction of the video signal array, outer codes are defined in the longitudinal direction, and the overall error correction codes are computed in the lateral direction and longitudinal direction to comprise product codes.
The inner codes comprise the error correction codes between data which are relatively close in the recording pattern. Inner codes are considered effective for random errors.
The outer codes comprise the error correction codes for data which are as far apart as possible in the recording pattern. Outer codes are considered effective for burst-like errors such as for example where the video signals are continuously lost due to scratches on the magnetic tape.
FIGS. 1A and 1B are views of the configuration of a conventional digital VTR. FIG. 1A shows the recording system of the digital VTR, while FIG. 1B shows the reproduction system of the digital VTR.
The recording system for a digital VTR shown in FIG. 1A includes an A/D converter 3, an outer code error correction code (ECC) processing circuit 4, a shuffling circuit 5, a synchronization signal and index (ID) signal adding circuit 6, an inner code ECC circuit 7, a modulation circuit 8, a recording amplification circuit 9, and a recording head unit 10.
The reproduction system of the VTR shown in FIG. 1B includes a reproduction head unit 11, a reproduction amplification circuit 12, a demodulation circuit 13, an inner code decoding circuit 14, a deshuffling circuit 15, an outer code decoding circuit 16, an error concealment processing circuit 17, and a D/A converter 18.
The VTR shown in FIG. 1A and FIG. 1B records video signals consisting of component video signals comprised of red (R), green (G), and blue (B) signals or of luminance signals Y, first chrominance signals P.sub.B, and second chrominance signals P.sub.R on the magnetic tape 1 and reproduces those component signals. In the following description, as the component video signals, illustration will be made of the case of recording and reproduction of luminance signals Y, first chrominance signals P.sub.B, and second chrominance signals P.sub.R on and from a magnetic tape 1.
The operation of the recording system of the digital VTR shown in FIG. 1A will be explained next.
When the recording video signals are analog signals in format, the analog video signals are converted to digital video signals at the A/D converter 3 and then supplied to the outer code ECC circuit 4. When the video signals are digital signals in format, they are directly supplied to the outer code ECC circuit 4 without A/D conversion.
The outer code ECC circuit 4 computes the outer codes for error correction at the time of reproduction and adds the outer codes to the recording video sign
Henmi Fumiaki
Inoue Takao
Kawahara Minoru
Yoshinaka Tadaaki
Brown Thomas E.
Elmore Reba I.
Frommer William S.
Sony Corporation
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